.20 cal. Preliminary data
Got a .20 cal. barrel from Chimp in trade awhile back, but have been too busy to do much shooting with it. Plus, I seem to burn through pellets faster than anticipated, so I keep running out of ammo :-). Anyway, got a couple of tins of Kodiaks, and finally made some time today to actually shoot it. At first, I was having some issues with consistency. I’d get 2 or 3 in the same hole at 30 yards, then it would shift, and the next couple would go in the same hole, but a 1/4″ away from the first ones. I had been shooting my 18″ .177 barrel, had the TH way down, only .034″. Turned it up for the .20, at .040″ I was getting mid 800’s. Still inconsistent. Then it finally dawned on me, the consistency got worse the lower the velocity went. Jacked the TH up to .050″, better, velocity right at 900 fps, but still a little erratic. Went to .060″, velocity in the low/mid 900’s, and now this thing was getting impressive! I shot half a dozen consecutive really tight 5 shot groups, one holers or damn close to it, all at 30 yards. Of course, by now I’m running low on ammo again, so I decided to stop for now. I think it could stand even more velocity, maybe take the TH to .070″ or so, see if I can get Kodiaks close to 1000 fps. So for now, the setup is TH @ .060″, PW @ 2, Kodiaks averaging about 925 fps and grouping at 1/4″ at 30 yards. BTW, it absolutely HATES JSB Predators at any velocity. Kodiaks were going in one hole, I couldn’t keep Predators inside one inch. Anyone need a nearly full tin of .20 Predators?
I still have more testing to do with this barrel. It’s NOT an Air Force barrel, not sure about the details, maybe Chimp will chime in and fill in the blanks. I’m thinking this is going to be a really good barrel for high velocity with the heaviest pellets available. I had a few CP’s, they did very well, I’ve got a box on order right now. I think I screwed up, I should have ordered a tin of EJ’s and instead I ordered some light weights. Oh well, maybe I’ll get lucky. Guess that’s it for now, more later, when my pellets get here. Later.
Dave
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Next time I go out I’ll double check my results.
Somehow that does not make sense. If you are getting 950 fps at 1000 psi, you should also be able to get 950 fps running on CO2, because CO2 is at 1000 psi. Or am i mistaken with CO2 pressure?
🙂 dave i can’t wait to hear further results.i’m on the shelf about getting a .20 barrel.after some fustration shooting sessions with my .25 i almost gave up but after reading a few tips on adjusting the tophat and pw i just shot my first moa 100yrd group(5 shots) with a airgun. 20 shots @60ftlbs 190 bar fill and finish at 160 bar with a 13fps extreme spead over the string.
Right on Dave. Yeah, my gun does NOT like a 3000 fill. Although i seem to be getting a boat load of 950 shots from a 2200 fill and it will keep them in that range all the way down to 1000. This is with 14.3 grain C.P’s. We’ll see what the Kodiaks do when they get here. I’m thinking about setting my top hat to .070 (right now it’s at .060), filling to 3000, setting the P.W. to 6 and shooting 10 strings. Then hook back up to my tank and check the remaining pressure. How would you do it?
I knew I was forgetting something, Sam :-). I pretty much always fill to 3000, may finally do some experimenting at lower pressure when my current N2 tank drops below 3K. So, it was fill to 3K, 30 shots had it down to 2600 psi. Pretty good, I think, considering it’s averaging ~25 fpe. Just heard from PA, order finally shipped today (ordered last Sun.!), so they won’t be here until NEXT Thurs. I’ll probably do more with it next weekend, along with something else I think you and others will be interested in. More to come :-)!
Dave
Dave only thing you left out was, what fill pressure do you fill to? I’ll be watching this topic for your update after you get the pellets.
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DaveD,
Thanks for the testing and preliminary info.
Sorry about the delayed response, just got back into town from a long vacation..
The following link has all the info in the 20’s. I have 3 left if anyone is intrested – PM me.
“http://talonairgun.com/forum/viewtopic.php?t=2679”
Regards,
Chimp